The weapon weight influenced the AS (attacking speed) in older FE parts.
In FE12 and 13 this mechanic was disabled. Every unit can use its weapons independent on its strength or constitution without any speed penalty.
In the GBA games the constitution of an unit influences the attacking speed.
To my mind it's kinda unfair for some classes and especially female characters, who always have a lower constitution than males. For example Lyn or Eirika cannot use steel swords without speed penalty same for Pegasus Knights, who want to use steel lances.
I personally prefer the mechanic, which exists in some other parts that the strength influences the AS. It's fairer for the classes. Every physical unit can reach the strength of the weapon weight.
However it's bad news for mages, who have very poor or even no strength growth (FE11). So it would be probably better, if the magic stat influences the weight instaed of strength.
So shall the weapon weight return?
And if yes, which stat should influence the AS?